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23 Nov 2019

Asumming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum ph of 4.6 to 4.8?(A) CH3COO2Na/CH3COOH (Ka =1.8*10^-5)(B) NH3/NH4Cl(Ka =5.6*10^-10)(C) NaOCl/HOCl (Ka =3.2*10^-8)(D) NaNO2/HNO2 (Ka=4.5*10^-4)(E) NaCl/HCLPlease explain

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Irving Heathcote
Irving HeathcoteLv2
15 Jan 2019

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Related questions

Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 4.6 – 4.8?
 
 

The following is a list of weak acids and their Ka values.

HOCl hypochlorous acid 3.5 x 10^-8

H2S hydrogen sulfide 1.1 x 10^-7

HCN hydrocyanic acid 4.0 x 10^-10

HNO2 nitrous acid 4.5 x 10^-4

a. Which acid given above is the strongest? Explain your choice

b. Write the Ka expression for the strongest acid.

c. List the conjugate bases of each of the weak acids above and determine their Kb values.

d. Which acid has the strongest conjugate base? Explain your choice.

e. Determine the pH and pOH of a 0.1M solution of each.

Please explain to me thank you.

Which one of the following aqueous solutions, when mixed with an equal volume of 0.10 mol L-1 aqueous NH3, will produce a buffer solution?

A) 0.10 mol L-1 CH3COOH

B) 0.050 mol L-1 NaOH

C) 0.20 mol L-1 NH4Cl

D) 0.20 mol L-1 HCl

E) 0.10 mol L-1 HCl

NUMBER 2

Which of the following has the highest buffer capacity?

A) 0.10 M H2PO4- / 0.10 M HPO42-

B) 0.50 M H2PO4- / 0.10 M HPO42-

C) They all have the same buffer capacity.

D) 0.10 M H2PO4- / 0.50 M HPO42-

E) 0.50 M H2PO4- / 0.50 M HPO42-

NUMBER 3

Which of the following acids should be used to prepare a buffer with a pH of 4.5?

A) HBrO, Ka = 2.3 ✕ 10-9

B) CH3COOH, Ka = 1.8 ✕ 10-5

C) C5H5O5COOH-2, Ka = 4.0 ✕ 10-6

D) C6H4(COOH)2, Ka = 2.9 ✕ 10-4

E) HOC6H4OCOOH, Ka = 1.0 ✕ 10-3

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